Induction sealing of paperboard

Details Induction sealing of paperboard Induction sealing of paperboard

1985-01-30

1987-01-20

Wityshyn, Michael

Package making

Methods

Enclosing contents within progressively formed web means

53551, 53373, 53DIG2, 219 1075, 219 1079, 1562724, 1562737, 1562751, 156290, 1563084, 1563096, B65B 908, B65B 922

Patent

active

046371990

ABSTRACT:
A method and apparatus for use in form, fill, and seal machines wherein a polyfoil material is compressed between two jaws, one jaw having a secondary induction coil which passes through an electromagnetic field and induces a current in the metallic layer of the polyfoil, to heat and then seal the polyfoil. In a preferred embodiment, a plurality of nonconductive sealing jaws, each containing a secondary induction coil, are mounted on an endless carrying means and a plurality of opposing corresponding rigid pressure jaws are also mounted on an endless carrying means and are arranged so that, as the carrying means advance continuously, each sealing jaw and corresponding pressure jaw contact and compress together facing thermoplastic layers of a polyfoil material and each secondary coil passes through an electromagnetic field to induce a current in the secondary induction coil which in turn induces a current in the area of the metallic foil layer proximate to the secondary induction coil to heat the foil and soften the adjacent thermoplastic materials which, because they are pressed together, will fuse and harden upon cooling. In continuous transverse sealing of a filled polyfoil tube, the pressure jaws may include a knife to sever the seals, the polyfoil tube may be preformed before it is sealed, and the sealing and pressure jaws may have an alignment means to facilitate severing and sealing. The secondary induction coil is preferably an elongated twin loop coil folded so that one loop is fully subjected to the electromagnetic field and the second loop induces a current in the polyfoil tube.

REFERENCES:
patent: 513271 (1884-01-01), Matthews
patent: 2479290 (1949-08-01), Auxier et al.
patent: 2492530 (1949-12-01), Kriegsheim
patent: 2506626 (1950-05-01), Zottu
patent: 2542901 (1951-02-01), Chaffee
patent: 2612595 (1952-09-01), Warren
patent: 2621704 (1952-12-01), Langer
patent: 2631642 (1955-03-01), Richardson et al.
patent: 2708649 (1955-05-01), Cunningham
patent: 2920173 (1960-01-01), Wastberg
patent: 3027443 (1962-03-01), Reed et al.
patent: 3109080 (1963-10-01), Pungs et al.
patent: 3140218 (1964-07-01), Hannon
patent: 3234072 (1966-02-01), Dreeben
patent: 3234072 (1966-08-01), Dreeben
patent: 3300365 (1967-01-01), Roos
patent: 3367808 (1968-02-01), Edwards
patent: 3396258 (1968-08-01), Leatherman
patent: 3424885 (1969-01-01), Garney et al.
patent: 3450856 (1969-06-01), Buck et al.
patent: 3462336 (1969-08-01), Leatherman
patent: 3472721 (1969-10-01), Abramson et al.
patent: 3556887 (1971-01-01), Adcock et al.
patent: 3574031 (1971-04-01), Heller et al.
patent: 3652361 (1972-03-01), Leatherman
patent: 3707773 (1973-01-01), Wolfberg et al.
patent: 3723212 (1973-03-01), Casper
patent: 3730804 (1973-05-01), Dickey
patent: 3754456 (1973-08-01), Andrews et al.
patent: 3808074 (1974-04-01), Smith et al.
patent: 3837961 (1974-09-01), Vouillemin
patent: 3864186 (1973-01-01), Balla
patent: 3874976 (1975-04-01), MacFarland, Jr.
patent: 3879247 (1975-04-01), Dickey
patent: 3883386 (1975-05-01), Garbini et al.
patent: 3927297 (1975-12-01), Reil
patent: 3940305 (1976-02-01), Stenberg
patent: 3948720 (1976-04-01), Reil
patent: 4009551 (1977-03-01), Greenawalt
patent: 4060443 (1977-11-01), Balla
patent: 4074504 (1978-02-01), Greenawalt
patent: 4160144 (1979-07-01), Kashyap et al.
patent: 4186044 (1980-01-01), Bradley et al.
patent: 4224494 (1980-09-01), Reboux
patent: 4248653 (1981-02-01), Gerber
patent: 4264668 (1981-04-01), Balla
patent: 4316709 (1982-02-01), Petersson et al.
patent: 4330351 (1982-05-01), LoMaglio
patent: 4353196 (1982-10-01), Beer
patent: 4391081 (1983-07-01), Kovacs
patent: 4512138 (1985-04-01), Greenawalt
patent: 4546596 (1985-10-01), Cherney
High Frequency Heating Review, vol. 1, No. 8, Lepel High Frequency Laboratories, Inc.

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